EP 2571165 A1 20130320 - ACCUMULATOR TYPE FRACTIONAL-N PLL SYNTHESIZER AND CONTROL METHOD THEREOF
Title (en)
ACCUMULATOR TYPE FRACTIONAL-N PLL SYNTHESIZER AND CONTROL METHOD THEREOF
Title (de)
FRACTIONAL-N-PLL-SYNTHESIZER MIT EINEM AKKUMULATOR UND STEUERVERFAHREN DAFÜR
Title (fr)
SYNTHÉTISEUR À BOUCLE À VERROUILLAGE DE PHASE FRACTIONNAIRE DU TYPE ACCUMULATEUR ET PROCÉDÉ DE COMMANDE DE CELUI-CI
Publication
Application
Priority
- JP 2011111642 A 20110518
- JP 2012003089 W 20120511
Abstract (en)
There are provided an accumulator-type fractional N-PLL synthesizer for suppressing the fractional spurious caused by periodically switching a frequency division number of a fractional frequency divider, and a control method thereof. In an accumulator-type fractional N-PLL synthesizer (100), a pulse signal proportional to a fractional phase error occurring between a reference signal and an output signal of a fractional divider (112) for feeding back an output of a VCO (115) of an output stage to a preceding stage is generated using an error signal from an accumulator (120). Through the use of the pulse signal, pulse widths of a UP signal and a DN signal output from a phase detector (140) are controlled so as to reduce a fractional phase error occurring between the UP signal and the DN signal. Thus, the fractional spurious caused by periodically switching the frequency division number of the fractional divider (112) is suppressed.
IPC 8 full level
H03L 7/089 (2006.01); H03L 7/197 (2006.01)
CPC (source: EP US)
H03L 7/085 (2013.01 - US); H03L 7/089 (2013.01 - EP US); H03L 7/1976 (2013.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 2571165 A1 20130320; EP 2571165 A4 20141029; EP 2571165 B1 20151021; CN 102959868 A 20130306; CN 102959868 B 20150916; JP 5643839 B2 20141217; JP WO2012157234 A1 20140731; US 2013088300 A1 20130411; US 9019016 B2 20150428; WO 2012157234 A1 20121122
DOCDB simple family (application)
EP 12785046 A 20120511; CN 201280001729 A 20120511; JP 2012003089 W 20120511; JP 2012544778 A 20120511; US 201213701955 A 20120511